This is a simple adapter box allowing standard surface mount automotive DC switches to be mounted in places they wouldn't usually go. LIke the surface of .75" MDF for example!
This should be printed without supports. I recommend using ABS or PETG/PET+ as they are slightly more flexible that PLA. If using PLA, I suggest slightly heating the part with a hairdryer before assembling and disassembling to increase flexibility. Scaling is not recommended as the part is designed to be printed with specific tolerances and scaling will make the tolerance too loose or to tight depending on which direction it is scaled.
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